Anyway, I've made two more loaves of sourdough since the first one. The second was a more traditional bread, with short-ish rises and lots of kneading, and it was fine. It rose well, the crumb is nice and even. Like a regular loaf of bread, with a bit of a sour taste. Nothing to write home about.
Here it is sliced open.

It was not really what I was going for, so I went back to the no-knead recipe, and this time I, you know, actually followed the directions. And it came out great!

Unfortunately, I ignored one of the crucial parts of the recipe, because a couple of blogs said I could: the preheating-the-pot part. So I put my dough in the dutch oven, cold, and then put it in a cold oven before turning it up to 425. As a result, the bread became one with the bottom of the pan. Here's what it looked like once I managed to scrape and pry most of the loaf from it.

I had to do two rounds of soaking to get the pan clean. I did some further googling, and it sounds like you can use parchment paper to avoid the problem. There's a "local foods" potluck this Saturday as part of 350.org, and I plan on bringing a loaf of local-yeast bread. And it will be perfect! Or the greenhouse gases will have won!